Application Guide

System Application Guide SAG582140000
Spec. No. 582140000 (Models 802
NLDB, 802NLEB and 802NL-B) Issue AW, June 3, 2014
Page 111 of 134
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(3) Backup: If Rectifier output voltage exceeds a second (non-adjustable) value,
the Rectifier shuts down and locks out regardless of load. Manual restart is
then required.
3.5.7 DC/DC Converter Failure: If a Rectifier's DC/DC converter fails, the Rectifier shuts down.
After approximately 3 seconds, the Rectifier automatically restarts. If a DC/DC converter
failure condition occurs again within 5 minutes, the Rectifier shuts down and locks out. Manual
restart is then required. If the Rectifier does not experience a DC/DC converter failure
condition within the 5 minute time period, the restart circuit is reset.
3.5.8 Power Factor Corrector Converter Failure: If a Rectifier's power factor corrector converter
fails, the Rectifier shuts down. After approximately 3 seconds, the Rectifier automatically
restarts. If a power factor corrector failure condition occurs again within 5 minutes, the
Rectifier shuts down and locks out. Manual restart is then required. If the Rectifier does not
experience a power factor corrector failure condition within the 5 minute time period, the restart
circuit is reset.
3.5.9 Thermal Shutdown: If the internal temperature of a Rectifier exceeds the over temperature
protection threshold, the Rectifier shuts down. After approximately 3 minutes, the Rectifier
automatically restarts. If the internal temperature of the Rectifier again exceeds the over
temperature protection threshold within 30 minutes, the Rectifier shuts down and locks out.
Manual restart is then required. If the internal temperature of the Rectifier does not exceed the
over temperature protection threshold within the 30 minute time period, the thermal shutdown
lockout circuit is reset.
3.5.10 Paralleling: This system may be connected in parallel with any rectifier of the same polarity
and adjusted to the same output voltage.
3.5.11 Load Sharing: The MCA load sharing feature automatically balances the load to within ±3%
of the Rectifiers rated output currents. If the MCA's load sharing feature is disabled for any
reason, pre-programmed slope control in each Rectifier balances the load to within ±10% of
their rated output currents. The MCA will balance a system of up to 50 Rectifiers within 5
minutes. Load sharing is enabled when the load is between 10% and 95% capacity. In Power
Share applications, load sharing is enabled once the legacy plant is 100% loaded.
3.5.12 Output Current Walk-In: Output current gradually increases after the system is switched on,
or AC service is supplied or restored as indicated below. Elapsed time is constant at 10.2
seconds.
3.5.13 Cooling: Each Rectifier contains multiple fans for forced convection cooling. If one fan in a
Rectifier fails, the Rectifier continues to operate but at reduced output current (maximum output
current is reduced to 50% of rated output current). If two or more fans fail, the Rectifier's power
conversion circuitry inhibits.
3.5.14 Local Controls: Refer to the "Operating Procedures" chapter in the Power System User
Instructions (Section 5877) for a complete description.
(A) Standby/Operate Switch
3.5.15 Local Status and Alarm Indicators: Refer to the "Operating Procedures" chapter in the
Power System User Instructions (Section 5877) for a complete description.
(A) AC/Identification (Green)
(B) Rectifier Fail / Minor (Red / Yellow) (208V Rectifier)
(C) Protection Alarm (Yellow) (480V Rectifier)
(D) Fail Alarm (Red) (480V Rectifier)
(E) A 10-segment Green LED Indicator Bar is located on the front panel to represent output
current, each segment represents 20A (blinks when in overload condition).
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